How One Who Has Given Someone the Evil Eye Should Wash...
The Prophet's Guidance on Treating Those Touched by the Evil Eye
Imaam Muslim (and Ahmad, Ibn Hibban, Al Hakim, and At Tabaraani narrated that Ibn 'Abbaas said, The Messenger of Allaah (Sallallahu Alaihi wa Salaam) said: "The evil eye is true and if there's anything that would precede Predestination it would be the evil eye."
Also, Muslim narrated that Anas said: "The Prophet (Sallallahu Alaihi wa Salaam) has allowed using Islaamic prayer formulas (Ruqyah, divine remedy) against fever, the evil eye and sores."
In As Saheehayn (Bukhaaree and Muslim) it's narrated that Abu Hurairah said that the Messenger of Allaah (Sallallahu Alaihi wa Salaam) said, "The evil eye is true."
{Abu Daawud, Ibn Maajah and Ahmad}
Abu Daawud reported that 'Aaishah said, "The person who touched others with the evil eye was commanded to perform ablution and the person whom he touched by the evil eye would wash with that water."
{Bukhaaree, Muslim, An Nasaa-ee, Ibn Maajah, Abu Na'eem, and Al Ismaa'eeli}
Further, 'Aaishah narrated as the Saheehayn reported: "The Prophet (Sallallahu Alaihi wa Salaam) commanded me (or commanded) that we should use Islaamic prayer formulas from the evil eye.
Asmaa Bin Umays said: "I said, O Messenger of Allaah (Sallallahu Alaihi wa Salaam)! The children of Ja'far are usually touched by the evil eye. Should I perform an Islaamic prayer formula for them? He (Sallallahu Alaihi wa Salaam) said, "Yes. If there is anything that precedes Predestination, it would be the evil eye."
{An Nasaa-ee, and Ahmad}
Also, Imaam Maalik narrated that 'Amir ibn Rabi'ah once saw Sahl bin Hunaif take a bath and said, "By Allaah! I have never seen the skin of a virgin that is softer than what I have just seen." Sahl feel to the ground. The Prophet (Sallallahu Alaihi wa Salaam) then cam to 'Amir while angry and said to him: "Why would one of you kill his own brother? Why have you not said Tabrik (i.e. to say Baarakallaah - may Allaah bless it)? Take a bath for it." 'Amir then washed his face, hands, elbows, knees, feet and a part of his garment in a pot for what he has done and then poured the used water on Sahl. Soon after, Sahl started moving about the people.
{An Nasaa-ee, Ibn Maajah, Ahmad, Al Hakim, and Ibn Hibban}
Maalik also narrated: "The evil is true, so perform ablution for it."
Another hadeeth narrated by 'Abdur Razzaaq reads: "The evil eye is true and if there is anything that precedes Predestination it would be the evil eye. When one is touched by the evil eye, he should take a bath for it."
At Tirmidhee said: "The person who touched others with the evil eye should be commanded to submerge his hand in a pot of water and them wash his mouth, then spit the water back into the pot. He should then wash his face in the pot, then submerge his left hand in it and pour some water on the right knee above the pot and then submerge his right hand and pour water on his left knee. He should then wash his garment inside the pot and the water should not be spilled on the ground. Rather, it should be poured on top of the person whom he touched by the evil eye from behind all at once."
Source:
Healing with the Medicine of the Prophet
Imaam Ibnul Qayyim al Jawziyyah
Chapter: The Prophet's Guidance on using Divine
Pages 145 - 147